Efficient conversion of fluorinated greenhouse gases using aluminum-doped hydroxyapatite

IF 4.8 2区化学 Q2 CHEMISTRY, PHYSICAL Applied Catalysis A: General Pub Date : 2025-02-05 Epub Date: 2024-12-24 DOI:10.1016/j.apcata.2024.120089

Yiwei Sun , Xiaoli Wei , Sihui Wu , Fangcao Liu , Bing Liu , Wenfeng Han

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Abstract

In this study, a series of hydroxyl apatite catalysts (HA-xAl) with varying aluminum doping levels were synthesized using a hydrothermal method. The influence of aluminum doping on the activity and catalytic stability of HFC-152a dehydrofluorination was systematically investigated. Reaction rates were normalized according to the aluminum doping amount. The results revealed that the HA-5Al catalyst exhibited a high specific reaction rate of 16,500 mmol·h⁻¹ ·mol⁻¹ Al, indicating a significant enhancement in catalytic efficiency due to aluminum incorporation into the hydroxyapatite. Furthermore, the HA-20Al catalyst demonstrated a conversion exceeding 63 % after 100 h of reaction. This remarkable stability is attributed to the formation of a metastable active species, F-Al-O, which likely results from the limited interaction with the hydroxyapatite structure. Additionally, the optimal acidity and highly dispersed active sites of catalysts contribute to reduced carbon deposition and further enhance its stability.

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利用掺铝羟基磷灰石高效转化氟化温室气体

本研究采用水热法合成了一系列不同铝掺杂水平的羟基磷灰石催化剂（HA-xAl）。系统研究了铝掺杂对HFC-152a脱氢氟化反应活性和催化稳定性的影响。反应速率根据铝掺杂量归一化。结果表明，HA-5Al催化剂的比反应速率高达16500 mmol·h⁻¹ ·mol⁻¹ Al，表明铝在羟基磷灰石中的掺入显著提高了催化效率。在反应100 h后，HA-20Al催化剂的转化率超过63 %。这种显著的稳定性归因于一种亚稳活性物质F-Al-O的形成，这可能是由于与羟基磷灰石结构的有限相互作用造成的。此外，催化剂的最佳酸度和高度分散的活性位点有助于减少碳沉积，进一步提高其稳定性。

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.